R&S AFQ100A
Bit Error Rate Measurements - BERT Block
1401.3084.32 4.79
E-3
Note:
If the data is not enabled, the BER measurement is stopped completely. The identification circuit for
Pattern Ignore
as well as the PRBS generator of the BER measurement wait as long as the data is
not enabled. If the data is enabled, the measurement is continued.
Example:
access
user data
guard
header
clock
data
enable
frame
data
The figure shows a TDMA signal with user data that contains the PRBS data sequence and various
check fields which should be ignored for the bit error rate measurement. Below that are the associated
clock and
Data Enable
signals.
Not Used
Any signal at the
Data Enable
input is ignored; all
data at the BERT data input is used for the
measurement.
Remote-control command:
BERT:SET:DEN OFF
Low
The
Data Enable
signal is used. The only data
measured is the data at the BERT data input
during a low level of the
Data Enable
signal. The
measurement is interrupted during a high level of
the
Data Enable
signal.
Remote-control command:
BERT:SET:DEN LOW
High
The
Data Enable
signal is used. The only data
measured is the data at the BERT data input
during a high level of the
Data Enable
signal. The
measurement is interrupted during a low level of
the
Data Enable
signal.
Remote-control command:
BERT:SET:DEN HIGH
